91856921 ÷ 23 
We want to figure out the number of times 91856921 can be divided by 23.

Step 1:
9 divided by 23 is 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Bring next digit (1) of the dividend behind the 9 and repeat the process: 91 / 23

Moving on to step 2:
The number 23 fits into 91 3 times, leaving a remainder of 22.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtracting 69 from 91 leaves us with 22.
Append the next digit (8) from the dividend to 22 and continue with: 228 / 23

Advancing to step 3:
If we divide 228 by 23, we get 9 and a remainder of 21.
Write down 9 as next digit of the result. 
Result so far: 39.0
The remainder is 21 after subtracting 207 from 228.
Take the next digit (5) from the dividend and append it to 21, then repeat: 215 / 23

Let's proceed to step 4:
If we divide 215 by 23, we get 9 and a remainder of 8.
Write down 9 as next digit of the result. 
Result so far: 399.0
If we take 207 away from 215, we end up with 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 23

On to step 5:
23 can be fit into 86 3 times, resulting in a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 3993.0
Subtract 69 from 86 to get 17.
Fetch the next digit (9) from the dividend, attach it to 17 and continue: 179 / 23

On to step 6:
When dividing 179 by 23, we get 7 with a remainder of 18.
The number 7 becomes the next digit in our result. 
Result so far: 39937.0
Subtracting 161 from 179 leaves us with 18.
Append the next digit (2) from the dividend to 18 and continue with: 182 / 23

On to step 7:
182 divided by 23 is 7 with a remainder of 21.
Write down 7 as next digit of the result. 
Result so far: 399377.0
The remainder is 21 after subtracting 161 from 182.
Grab the next digit (1) from the dividend, add it to 21, then carry on: 211 / 23

On to step 8:
If we divide 211 by 23, we get 9 and a remainder of 4.
The number 9 becomes the next digit in our result. 
Result so far: 3993779.0
If we subtract 207 from 211, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 9:
40 divided by 23 is 1 with a remainder of 17.
Use 1 as the next digit of our solution. 
Result so far: 3993779.1
Subtract 23 from 40 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 10:
170 divided by 23 is 7 with a remainder of 9.
Record the quotient 7 as the next digit in the result. 
Result so far: 3993779.17
The remainder is 9 after subtracting 161 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 11:
23 goes into 90 3 times with a remainder of 21.
The number 3 becomes the next digit in our result. 
Result so far: 3993779.173
If we subtract 69 from 90, we get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 12:
If we divide 210 by 23, we get 9 and a remainder of 3.
Record the quotient 9 as the next digit in the result. 
Result so far: 3993779.1739
The remainder is 3 after subtracting 207 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 13:
23 goes into 30 1 times with a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 3993779.17391
Subtracting 23 from 30 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 14:
When dividing 70 by 23, we get 3 with a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 3993779.173913
Subtract 69 from 70 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 15:
The number 23 fits into 10 0 times, leaving a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 3993779.173913
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 16:
100 divided by 23 is 4 with a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 3993779.17391304
If we subtract 92 from 100, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

In conclusion, the division gives 3993779.17391304 with a balance of 8e-09.